Read serialized data from subprocess call to python script in groovy

Question

I have a groovy code in which a python script is invoked. Is there a way to read the json serialized data printed/returned by the python script?

Groovy code to call python script:

def sout = new StringBuilder(), serr = new StringBuilder()
def cmd = ["python2.7","myscript.py"]
def proc = cmd.execute()
proc.consumeProcessOutput(sout, serr)
proc.waitFor()
def parser = new JsonSlurper()
def jsonResp = parser.parseText(sout[0])
log.debug(jsonResp)

Python script:

dd = {'key1': 'value1', 
      'key2':'value2', 
      'key3': {'key31':'value31'}
      }
print json.dumps(dd)

Output:

jsonResp = {} when the code is run.

jsonResp['key1'] also is empty implying that json is not read from process output.

https://stackoverflow.com/questions/50799111/unable-to-capture-full-output-from-groovy-execute/50799554#50799554 — daggett, Jul 04 '18 at 12:14
have u got any error in above code ? or are u looking for another method ? — Bhanuchander Udhayakumar, Jul 04 '18 at 15:16
@Uchiha_Itachi the value of jsonResp = {}. The serialized json is not getting read correctly. I am not sure if print json.dumps(dd) is the right way to pass data back to groovy script. — minzey, Jul 04 '18 at 15:31

score 0 · Answer 1 · answered Jul 05 '18 at 05:59

You may be looking for this:

print json.drumps(dd) from the python code works well and completed its work. you have to read the process output inside the groovy code correctly.

In groovy script, def jsonResp = parser.parseText(sout[0]) you are using java.lang.StringBuilder as Array list. This will act like String []. So you are loading first character "{" of your string sout[0]in total String.

I don't know why you put it like this.

JsonSlurper().parseText only allows the String argument See doc. You can use it like below shown ways:

parseText(sout.toString())
parseText(sout.readLines())

Read serialized data from subprocess call to python script in groovy

1 Answers1